Valve seat reconstruction tool



Sept. 29, 1931. N. F. MCNAUGHT VALVE SEAT RECONSTRUCTION TOOL Filed Oct. l1l 1928 atented Sept. 29, 1.931n i,

g UNITED 7STATESP1ATENT l OFFICE;

NoRRIs F. *MCNAUGH'L or oIIIoieeo,Y ILI'iINoIsnssIGNoR 'ro nono METAL rnonnevrs COMPANY, or cIIIoAGdILLINoIs-A CORPORATION or ILLINOIS VALVE SEAT REY-CONSTRUCTION TGOL .Application led October 11,v 19218. Serial No. 311,724.

The present invention lrelates to valveseat refacing tools, and is particularly concerned with tools for refacing the valves of internal .Combustion engines. y p

One of the objects of the invention is the provision .of a novel; method of manufacture for valve seat reamers and the like, V,which is capable of producing a serviceable tool of vthe class described, `at a minimumfcost.

Another obJect is the` provision of an 1mproved value seat tool construction which 1s cheaper and more efficient thanthe tools of the prior art, by the use of inexpensive metal for its construction. I .A Y

' Another object is the provision of a'vvalve `seat reamer lwhich is more quickly and economically manufactured so that the tools may ,be produced in quantity at a low price within VA-the means ofthe occasional Vuser .of such .proved reamer -structure which is capable of OQlS- j i, Another object is the provision yof an imrefacing valve seatsv with a high degree of iLGGUF-acy..

l methodof securing cutter blades incast metal n without drawing the temper of thecutter.

.Another ,object is y the provision of a novel blades.

Other .obj ects and advantages .of the invern tion will be apparent from .the following description and fromthe accompanying .drawings, in which similar ycharacters oy reference indicate similar partsthroughout the several views.

Referring ,to the drawings, ofwhich `:there is one sheet;

Fig. 1 is a view in perspective of Va valve seat `reamer constructed .according to .the

present .invention withparts broken away to.

ishow the internal ,structure Fig. Zris a plan view of the same.;

Fig. 3 is a medial sectional view showing the structure of the arbor andbody.;`

VF ig. 4 is a sectional viewtalien, on lthe .line

.of Fig. 1, showing the engagement Vof anchoring formations .on thel blade .with the castmetalbody. Referringto Fig. 1,- 10 indicates valve lseat tool `its entirety, and .the-tool isfshown in conjunction with a conventionaliinternal combustion part 11 having a valve seat 12'v anda valve stem guide 13 located axially of thevalve seat 12. Although my invention is illustrated in ,conjunction with a .valYG .Seat

vreamer, I desire to be understoodthat the inventionmay be employed for the formar `tion of other valve .seat toolsl such .as tools for cutting *annularv rings in replacing valve seatsfortools .for reborlng @or other'operations, andthe Vpresent embodiment is to bey .regarded as illustrative of one form' of the .517.. lnthe preferred embodiment, Ithe valve reamer includes a plurality of similar cutter blades 17 `consisting of tempered steel members which may be formed of-sheet metal and vhaving. a plurality of lanchoring formations.'-

The anchoring formations may .consist of interlocking irregularities forme vat .therelr portion of .the blade away from Vthe exposed Y cutting edge 19 or the anchoring formations may takethe forni of oneor more apertures or-sockets 20 within which portionsi22 .ozthe body member'l are adapted'to Yengagewhen vthe device is manufactured.'

The blades 17 for a reamer are 'r'ieferably formed with ya relatively straig t cutting Iedge 1.9. which may lbe Vslightly beveled after the blade has been sharpened as .described hereinafter, and the upper edge .'23 ofthe blade preferably :extends backward at an` `acute angley in order to save material and .make the edgeofthe blade flush with ,the .top

,ofthe body 16. The Abottom 24.0f a blade 17 inayentend inward at an obtuseangle to .conyform toY the base of :the body member 16,

. while the rearvor in neredge maybe formed4 with anchoring portionsor @inany convenient .manner which-economy .of material may necessitate. f Y o f l y The body member 16 comprises acastginetal member formedV of die cast metal whichV is substantially ffrustoeconical in form, having basesland '2.7 `and 'sloping :sides A28.v In

-order .to enhancethe appearance of the body Fmember and give `it an increased lengthfor t.en:gagement withthe .arbor 1 4, fthe ypresent body member is formed with an axially extending boss 29. Axially located in the body member 16 and secured therein by forming the body member about the interlocking formations 30, 31 and 32, is the arbor 14. I

The Varbor 14 comprises a relatively short shaft 'which ma-y be provided with a noncircular upper end, or for reasons of economy may merely be provided with a transverse bore 33 of suiiicient size to receive a rod 34. The rod 34 may be secured in the bore 33 by providing the rod with a milled surface 35 at a point midway between its ends and the rod 34 may be driven into the bore 33 so that the milled surface 35 engages the walls of the bore and secures the handle permanently in the arbor.

The arbor 14 is preferably provided with anchoring formations 30 to 32, both for the u purpose of securing the body on the arbor against rotative motion and against axial motion. VThese anchoring formations may be varied considerably to' accomplish the same result, the essential feature beingthe formation of shoulders on the arbor 14 which engage formations Within the body member 16 so that the body member is securely'cast about 'the arbor, but a convenient method of making "such formations on the arbor Vconsists in H30' providing milled surfaces 30 and 32 and the annular groove 31 within which an integral 1ring`36 of the body member 16 may engage. The lower end 37 of the arbor may be reduced in size also, thereby increasing the holding engagement of the milled ridge 32.

Thearbor 14 is preferably provided with a I, pilot stem 15 andin order to accommodate my valve tool tovarious types of engines, I.

` prefer to make the pilot stem 15 removable so vthat any of a plurality of different sizes of pilot stems may be employed. As all of the -various pilot stemsY are of substantially the same construction, but merely of a different diameter, only one pilot stem is illustrate-d, it 'being' understood that a pilot stem should be used which corresponds most closely -to the size of the valve stem guide 13.

f The arbor 14 may Vbe provided with an l axially located bore 38 which may be threaded at its outer end as at 39; A pilot` stem-15 comprises a substantially cylindrical metal member having complementary threads 40 adjacent its upper end, and the extreme end 41 of the pilot stem ispreferably adapted to fit in the end of the bore 38 to ymore accurately align the pilot stem and arbor 14.

' method of 60 The operation of my valve seat tool will be obvious to those skilled inthe art,`butrthe manufacture of my tool is as follows.

The die fthe body member 16 flows ata relatively low ytemperature of from 600 to 700 degrees Fah-V ucast metal whichis employed forA 70 rIhe tools may be formed by ordinary castingoperations with sand molds, inl which Vcase a jig is provided for holding a plurality of blades 17, and the arbor 14, in a predetermined position as illustrated in Fig. 1. If

the operation is to be performed by a die casting machine the die itself will be constructed to hold the blades and arbor in predetermined position. Y As the construction of appropriate dies or jigs for this purpose will be known to those skilled in that art, further rdescription of such devices is considered unnecessary.

The blades and arborh'aving been secured in predetermined position, the body member 16 is formed by casting metal about the portions of the blades and arbor which are shown to be within the body in Fig. 1, and asthe cast metal is permitted to cool, it contracts and is forced into the anchoring formationsfgo such as the holes 20 in the blades, the groove 31 of the arbor and the grooves formed by the milling 30, 32, thereby permanently securing these parts together.-

The arbor 14 may be provided with the f9.5

bore 38 and threads 39 before or after the Vcasting operation, and a pilot stem 15 is now preferably placed in the arbor 14 and the `cutting surfaces 19V of the bladesare trued and sharpened with respect to the stem 15.51100 If desired, thls operation of truing and sharpening may be done with reference to the arbor itself, but the truing of the blades is preferably done with the pilot stem since the pilot stem is to be employed for holding `1105 the blades to rotate axially of the valve stem guide 13.

It will thus be observed that I have invented a novelvalve seat tool structure in which the cutter blades may be formed of f`110 ordinary stampings of sheet metal and the body of cast metal so that these parts may be manufactured and assembled at an extremely low cost.

My invention also comprises a novel method"A of manufacture whereby temperedsteel cutters maybe secured in cast metal without `drawing the temper ofthe cutters, and my cutter blades may be trued and sharpened with relation to thev pilot stem with whichlzc they are toY be employed, thereby assuring the Vaccuracy o f Ythe tool.

Vhile I have illustrated a preferred embodiment of my invention, lmany vmodifica-A tions may be made without departing from `V .the spirit of they invention, and I do not wish to be limited to the precise details of construction lset forth, but desireV toi avail myself of all changes within the scope of the appended claims;

Having thus described my invention, what 1 claim is new and desire to secure by Let-k ters Patent of the United States, is:

1. A valve seat reconstruction tool, com- 5 prising an arbor having anchoring formations thereon, a blade having anchoring for-v mations, and a body of cast metal formed about said formations, to provide a support for said arbor and blade. 10 2. A valve seat rearner, comprising a' vcast metal body, an arbor provided Withan any nular groove to anchor said arbor in said` body, said arbor being secured in said body by interengagement of the adjacent parts 15 of said body in the groove-of said arbor, andy a plurality of radially extending blades having apertures secured in said body by integral parts of said body passing through said apertures in said blades. 29 3. A valve seat reamer, comprising a cast metal body, an arbor provided with an annular groove to anchor said arbor in said body, and a threaded bore Jor receiving'a pilot, said arbor being secured in said body by interengagement of the adjacent parts of said'body in the groove of said arbor, a plurality of radially extending blades having apertures, secured in said body by integral parts of said body passing through said apera tures in said blades, and an axially extending pilot stem threaded in the bore of said arbor. In Witness whereof, I hereunto subscribe my name this 6 day of October, 1928. y

NORRIS F. MCNAUGHT.- 

